An account is given of the discovery of the larva of Kessleria fasciapennella (Stainton, 1849) amongst Parnassio palustris L. at Meall Mor, Argyll, Scotland. The larva had not been found previously in the British Isles and this is only the second British record of this species since the mid-nineteenth century. Unsuccessful searches for the species at three other Scottish localities are also reported. Previous known British records are given, differences are noted between the larval mine and larva observed in 2015 and a published account, variation in the ground colour of the forewing is recorded and differences are given between the adults of Kessleria fasciapennella and K. saxifragae (Stainton, 1868).
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